Google and IPv6

[Tim]

Hello,

Been using ipv6.google.com for a couple of days now as my default search
engine.  Been noticing some broken connectivity off and on for the last
day though, so thought I would bring it up.  Essentially requests are
just hanging indefinitely.  I'm really not well versed in debugging
routing issues, but here's what I'm seeing:

~> host ipv6.google.com 
ipv6.google.com is an alias for ipv6.l.google.com.
ipv6.l.google.com has IPv6 address 2001:4860:0:2001::68

~> tracepath6 -n 2001:4860:0:2001::68
 1?: [LOCALHOST]                      pmtu 1500
 1:  2002:4775:eda1:2::                 0.409ms 
 1:  2002:4775:eda1:2::                 0.322ms 
 2:  2002:4775:eda1:2::                 0.329ms pmtu 1480
 2:  2002:c058:6301::                  80.294ms 
 2:  2002:c058:6301::                  79.992ms 
 3:  2001:4978:1:410::ffff             82.114ms asymm  4 
 4:  2001:590::451f:6f15               82.759ms 
 5:  2001:590::451f:6f85               81.871ms asymm  6 
 6:  2001:590::4516:8e3d              100.075ms asymm  7 
 7:  2001:504:0:2:0:1:5169:1          182.722ms !A
     Resume: pmtu 1480 

~> traceroute6 -n 2001:4860:0:2001::68
traceroute to 2001:4860:0:2001::68 (2001:4860:0:2001::68) from
2002:4775:eda1:2::3:0, 30 hops max, 24 byte packets
 1  2002:4775:eda1:2::  0.163 ms  0.077 ms  0.075 ms
 2  2002:c058:6301::  75.727 ms  75.02 ms  74.404 ms
 3  2001:4978:1:410::ffff  75.002 ms  77.831 ms  74.701 ms
 4  2001:590::451f:6f15  75.074 ms  75.207 ms  74.954 ms
 5  2001:590::451f:6f85  74.655 ms  75.046 ms  77.293 ms
 6  2001:590::4516:8e3d  94.994 ms  95.442 ms  92.119 ms
 7  2001:504:0:2:0:1:5169:1  179.96 ms  177.397 ms  177.797 ms
 8  * * *
 9  2001:4860:0:2001::68  180.935 ms  179.936 ms  180.038 ms


As you can see, I'm using 6to4.  I'm able to reach my web server which
is also on 6to4, but that's probably not a surprise.  The other service
I use over v6 is IRC, and that's not on 6to4:

~> host ipv6.chat.freenode.net
ipv6.chat.freenode.net has IPv6 address 2001:6b0:e:2018::172
ipv6.chat.freenode.net has IPv6 address 2001:1418:13:1::25

~> tracepath6 -n 2001:1418:13:1::25
 1?: [LOCALHOST]                      pmtu 1500
 1:  2002:4775:eda1:2::                 1.523ms 
 1:  2002:4775:eda1:2::                 0.326ms 
 2:  2002:4775:eda1:2::                 0.329ms pmtu 1480
 2:  2002:c058:6301::                  80.374ms 
 2:  2002:c058:6301::                  79.961ms 
 3:  2001:4978:1:410::ffff             82.109ms asymm  4 
 4:  2001:1838::40ca:6f26              82.559ms 
 5:  2001:1838::d8f6:5ff2              83.169ms asymm  6 
 6:  2001:1900:4:2::29                225.737ms asymm  8 
 7:  2001:1900:4:1::5                 228.644ms 
 8:  2001:1900:6:1::1                 230.432ms asymm  6 
 9:  2001:1900:6:1::1                 227.034ms pmtu 1450
 9:  2001:1900:5:2::2a                227.557ms asymm  5 
 9:  2001:1900:5:2::2a                229.557ms asymm  5 
10:  2001:1418:1:700::a               232.490ms asymm  6 
11:  2001:1418:13:1::25               227.824ms reached
     Resume: pmtu 1450 hops 11 back 58 

~> tracepath6 -n 2001:6b0:e:2018::172
 1?: [LOCALHOST]                      pmtu 1500
 1:  2002:4775:eda1:2::                 1.089ms 
 1:  2002:4775:eda1:2::                 0.443ms 
 2:  2002:4775:eda1:2::                 0.330ms pmtu 1480
 2:  2002:c058:6301::                  80.614ms 
 2:  2002:c058:6301::                  82.639ms 
 3:  2001:4978:1:410::ffff             83.005ms asymm  4 
 4:  2001:470:0:7f::1                  83.713ms 
 5:  2001:470:0:4e::2                 103.043ms 
 6:  2001:470:0:3e::2                 172.584ms 
 7:  2001:470:0:3f::2                 182.677ms 
 8:  2001:7f8:1::a500:2603:1          201.492ms 
 9:  2001:948:0:f03f::1               203.493ms asymm  7 
10:  2001:948:0:f053::2               199.304ms asymm  4 
11:  2001:6b0:dead:beef:2::de         198.864ms asymm  5 
12:  2001:6b0:dead:beef:2::2e6        211.988ms asymm  5 
13:  2001:6b0:e::51                   211.150ms asymm  6 
14:  2001:6b0:e::62                   217.762ms asymm  7 
15:  2001:6b0:e:2018::172             210.209ms reached
     Resume: pmtu 1480 hops 15 back 57 

And this seems to be working fine for me (though it did drop
connectivity last night, but that could have just been the periodic DoS
attacks the network receives.)

However, www.arin.net is also giving me issues, as it too is hanging
indefinitely and the tracepath doesn't look so hot:

~> host www.arin.net
www.arin.net has address 192.149.252.7
www.arin.net has address 199.43.0.202
www.arin.net has IPv6 address 2001:500:4:1::80

~> tracepath6 -n 2001:500:4:1::80
 1?: [LOCALHOST]                      pmtu 1500
 1:  2002:4775:eda1:2::                 1.377ms 
 1:  2002:4775:eda1:2::                 0.324ms 
 2:  2002:4775:eda1:2::                 0.321ms pmtu 1480
 2:  2002:c058:6301::                  80.520ms 
 2:  2002:c058:6301::                  79.490ms 
 3:  2001:4978:1:410::ffff             82.598ms asymm  4 
 4:  2001:470:0:7f::1                  82.174ms 
 5:  2001:470:0:4e::2                 102.798ms 
 6:  2001:470:0:36::1                 110.181ms 
 7:  2001:504:0:2:0:1:745:1           207.068ms asymm  8 
 8:  no reply
 9:  no reply
10:  no reply
...



Anything else I could run to help provide more info?

thanks,
tim